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>42.4. Sharing Data</A
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>   The global dictionary <TT
CLASS="VARNAME"
>SD</TT
> is available to store
   data between function calls.  This variable is private static data.
   The global dictionary <TT
CLASS="VARNAME"
>GD</TT
> is public data,
   available to all Python functions within a session.  Use with
   care.
  </P
><P
>   Each function gets its own execution environment in the
   Python interpreter, so that global data and function arguments from
   <CODE
CLASS="FUNCTION"
>myfunc</CODE
> are not available to
   <CODE
CLASS="FUNCTION"
>myfunc2</CODE
>.  The exception is the data in the
   <TT
CLASS="VARNAME"
>GD</TT
> dictionary, as mentioned above.
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